It starts on the B4321 in Llangrannog and heads south as a narrow S1 road; the B4321 here is even narrower. After passing the village car park our road climbs out of the valley with some hairpin bends. Although the road does widen it is still S1 when it reaches the A485 at Brynhoffnant.

There is a short multiplex through the village and then the B4334 heads off south once again, this time as S2. It maintains its height for some distance but eventually descends to Brithdir and a bridge over the River Ceri. It then climbs again to Penrhiw-pâl, where it crosses the B4571 at a staggered crossroads. Then the road runs straight across the hillside to Coed-y-Bryn and down to Pengallt, where there is a sharp right turn.

The road continues to descend to Aber-banc, where it crosses the A475. A few hundred yards further on a spur of the B4334 heads off to the right; it reaches the A475 further west via a much steeper route. In 1922 this spur was the mainline of the B4334, which went no further north than the A475 (then numbered A482).

The road then crosses the preserved Teifi Valley Railway before going through Henllan. The road then crosses the River Teifi on a narrow bridge, changing county as it does so, before ending immediately afterwards at a T-junction on the A484.